Quote:
Originally Posted by LewisM
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Thanks for that Lewis.
Quote:
Originally Posted by niharika
Hi Greg, are you getting some sort of flex somewhere in the imaging train? Does the tip/tilt change across sky if you measure through ccdinspector? what's the back focus of the adapter between FLI FW and MOAG (assuming that's how the setup is). Few people found that getting a 0 length adapter between FLI FW and Moag allowed them to shave off some backfocus and reduce the flex due to thin front plate of the filter wheel. Just some thought.
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Hi Raki. Thanks for that. I'll check that out. Astrodonb has a zero length adapter for the MMOAG?
Quote:
Originally Posted by rally
Greg,
Niharika is on the right track
If you have tilt - you have a measurable problem.
Can you identify the source of the problem and solve that first.
If there is a fault, then fix it, if there is flex in an adapter or fitting then its either faulty or not suitable for the loads involved - get a better one.
I will assume that its in the optical train as opposed to mirror alignment ?
That would be my approach
Rally
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Thanks Rally. It appears to be at the junction of the filter wheel and the adapter to the MMOAG. That adapter is only 2mm thick. If I grab the camera and flex on it I can see some slight movement under stress at that point. Raki's suggestion may be spot on. Definitely not the mirror as I have gotten perfect round stars to the corners many times.
Greg.